Don't respond to messages sent by the robot itself

Sometimes the slack adapter sends for processing messages from the bot
itself and trying to reply to those messages fails with “Slack API call
to im.open returned an error: cannot_dm_bot”

lib/lita/handlers/cleverbot.rb

@@ -24,7 +24,19 @@ def reply(message)
       end
 
       def should_reply?(message)
-        message.command? || message.body =~ /#{aliases.join('|')}/i
+        !sent_by_robot?(message) && ( command?(message) || robot_mentioned?(message) )
+      end
+
+      def command?(message)
+        message.command?
+      end
+
+      def sent_by_robot?(message)
+        message.user.mention_name == robot.mention_name
+      end
+
+      def robot_mentioned?(message)
+        message.body =~ /#{aliases.join('|')}/i
       end
 
       def build_response(message)

lita-cleverbot.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "lita-cleverbot"
-  spec.version       = "1.0.0"
+  spec.version       = "1.0.1"
   spec.authors       = ["Cristian Bica"]
   spec.email         = ["cristian.bica@gmail.com"]
   spec.description   = "Lita AI via cleverbot.io"

spec/lita/handlers/cleverbot_spec.rb

@@ -29,6 +29,12 @@
       send_message("test", from: room)
     end
 
+    it "shouldn't reply to messages sent by the bot" do
+      expect_any_instance_of(Lita::Handlers::Cleverbot).to receive(:reply).never
+      robot_user = Lita::User.new(100, name: robot.mention_name)
+      send_message("Lita: test", as: robot_user, from: room)
+    end
+
     it "should try to reply to messages addressed to the robot" do
       expect_any_instance_of(Lita::Handlers::Cleverbot).to receive(:reply).once
       send_message("hey Lita, who am I?", from: room)